摘要
依据W-M分形函数建立了接触式机械密封摩擦副三维瞬态滑动接触模型,考虑了接触微凸体之间相互机械作用和摩擦的热力耦合,基于ABAQUS分析平台,首次提出了能够模拟机械密封摩擦副回转运动的计算模型,仿真分析了机械密封摩擦副在干运转条件下的摩擦特性.研究结果表明:接触面温度分布不均匀,局部温度很高,在接触微凸体中心区域出现极值;在滑动后很短时间内温度急剧上升,随着滑动进行,接触节点温度继续升高,但是温升速率减缓;粗糙体轴向温度梯度较大,其亚表层区域存在较大的热应力,易发生热损伤失效;在接触微凸体轴向距表层较近的局部区域存在拉应力,滑动行为会使微凸体内部拉应力区域扩大,拉应力的数值也增大.微凸体接触区轴向上的应力状态是变化的,依次为压应力-拉应力-压应力.
Based on W-M fractal function,a three-dimensional transient sliding contact model of the contact friction pair of a mechanical seal was established.The mechanical interaction and thermal-mechanical coupling of friction between contact micro-convex bodies have been considered.Based on ABAQUS,a new computational model has been proposed for the first time using which the rotary motion of mechanical seal friction pair can be numerically simulated.The friction characteristics of a mechanical seal friction pair under dry operation were simulated and analyzed.The results show that the temperature distribution of the contact surface was uneven,the local temperature was very high and the maximum appeared in the center area of the contact micro-convex body.The temperature rose sharply in a very short time after sliding and the temperature of the contact node was rising with sliding,while the temperature rising rate slowed down.The temperature gradient of the rough body along the axial direction was large and the sub-surface area had a large thermal stress,which made thermal damage failure much easier.There was tensile stress in the local zone near the surface of the contact micro-convex body in axial direction,the sliding behavior enlarged the tensile stress zone inside the micro-convex body and the tensile stress also increased.The stress of the contact zone of the micro-convex body changed in the axial direction which subjected to continuous compression-tension-compression.
作者
王计辉
陈志
顾灿鸿
邱海涛
吉华
WANG Jihui;CHEN Zhi;GU Canhong;QIU Haitao;JI Hua(School of Chemical Engineering,Sichuan University,Sichuan Chengdu 610065,China)
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2019年第6期737-745,共9页
Tribology
关键词
机械密封
干摩擦
分形理论
热力耦合
磨损
mechanical seal
dry friction
fractal theory
thermal-mechanical coupling
wear
